OA1NP datasheet(17/31 Pages) STMICROELECTRONICS

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OA1NP, OA2NP, OA4NP

Application information

4.1

Operating voltages

The OA1NP, OA2NP and OA4NP series of low power op amp can operate from 1.5 V to

5.5 V. Their parameters are fully specified at 1.8 V, 3.3 V, and 5 V supply voltages and are

very stable in the full VCC range. Additionally, main specifications are guaranteed on the

industrial temperature range from -40 to +85 ° C.

4.2

Rail-to-rail input

The OA1NP, OA2NP and OA4NP series is built with two complementary PMOS and NMOS

input differential pairs. Thus, these devices have a rail-to-rail input, and the input common

mode range is extended from VCC- - 0.1 V to VCC+ + 0.1 V.

The devices have been designed to prevent phase reversal behavior.

4.3

Input offset voltage drift over temperature

The maximum input voltage drift over the temperature variation is defined as the offset

variation related to the offset value measured at 25 °C. The operational amplifier is one of

the main circuits of the signal conditioning chain, and the amplifier input offset is a major

contributor to the chain accuracy. The signal chain accuracy at 25 °C can be compensated

during production at application level. The maximum input voltage drift over temperature

enables the system designer to anticipate the effects of temperature variations.

The maximum input voltage drift over temperature is computed in Equation 1.

Equation 1

with T = -40 °C and 85 °C.

The datasheet maximum value is guaranteed by measurements on a representative sample

size ensuring a Cpk (process capability index) greater than 2.

V

T

------------

max

io T

 V

io 25C



–

T25

C

–

--------------------------------------------------

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